The Bubbling Under Hip-Hop/R&B Songs is a chart composed of 10 positions that represent songs that are making progress to chart on the main Hip-Hop/R&B chart but didn't reach it yet. Many times, songs halt their progress at this chart and never debut on the Hot Hip-Hop/R&B Songs chart. The Bubbling Under Hip-Hop/R&B Songs chart can also be seen as a 10 position quasi-addendum to the chart, since the chart represents the 10 songs below position number 50, that have not previously appeared on the main chart.
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The music charts should be seen as promotion of the songs. Through the large range of charts, we make people aware of new songs that they might not know and therefore encourage them to buy it.